In one study, seven patients (26%) presenting with foot drop had had recent IM injections in the buttock. An additional 20 patients (74%) presented much later (Fatunde & Familusi, 2001).

Chlorpromazine can be administered by intramuscular injection or by mouth ... injected slowly into the upper outer quadrant of the buttocks, two or three minutes being required for injection ...

A 25-year-old male patient presented with foot drop indicative of a sciatic nerve injury following gluteal intramuscular (IM) injections. Blood tests and magnetic resonance imaging of his spine ...